In general, when you plan to prepare NPK fertilizer, there are two methods that are popular with NPK fertilizer manufactures. They are NPK fertilizer granulation line and NPK fertilizer blending system. The former can help you turn powder chemical fertilizer into NPK fertilizer pellets. While the latter can process granular chemical fertilizer into NPK fertilizer you need. You can choose one from them according to your material, budget, factory area, etc. If you have any requirements, you can contact us immediately for solutions. We can provide you with customized NPK fertilizer plant design.